
.haha{
    height: 200px;
    width: 50%;
    background-color: #b0e0e6;
}

/*web background*/

.ha{
    border-radius: 25px;/*圆角*/
    opacity: 0.7 ;/*透明度*/
    text-align: center;
    height: 350px;
    width: 350px;
    color: black;
    background-color: blanchedalmond;

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;


}
/* centered columns styles */
.row-centered {
    text-align:center;
}
.col-centered {
    display:inline-block;
    float:none;
    text-align:left;
    margin-right:-4px;
}

h1{
    color:white;
    text-align: center;
    position: relative;
    top: 13%;
}


h3{
    text-align: center;
    position: absolute;/*添加绝对定位*/
    top:700px;
    right: 45%;
    color: rebeccapurple;
}

